Hypodermic needle grinder



E. G. MASCARENHAS HYPODERMI C NEEDLE GRINDER Filed June 17, 1944 Fi :EL

IN VEN TOR.

En eas /Zacawenh a9 Patented Nov. 13, 1945 UNITED STATES PATENT OFFICE HYPODERMIC NEEDLE GRINDE-R Eneas G. Mascarenhas, Minas, Brazil Application June 17, 1944, Serial No. 540,779

2 Claims.

This invention relates to needle grinders and more particularly to a grinder for hypodermic needles.

An object of the invention is to provide a device with which it is possible to produce r reestablish in hypodermic needles a sharp point of a perfect frustum shape.

At the present time when hypodermic needles lose their point or become blunt resharpening is resorted to. But this work is done almost entirely by hand on an abrasive stone. Not only does the operation involve great skill and loss of time but in many instances a great deal more of the needle is ground down than necessary with a resulting waste.

An object of the present invention is to provide a device with which the proper point on the needle may be secured by anyone without training or unusual skill.

In the accompanying drawing- Figure 1 is a side elevation of my device;

Fig. 2 is a top plan view thereof;

Fig. 3 is a bottom plan view thereof;

Fig. 4 is a cross sectional view taken on the line 4-4 of Fig. 2;

Fig. 5 is a cross sectional View of the needle holding tool.

Referring more particularly to the drawing, my device consists of a block I0 which may be of any desired shape although made cylindrical it is easy to handle. The block I0 has a bore II drilled therethrough at a definite and proper angle. This bore is reduced at I2 to a narrower bore I4 only slightly larger than the diameter of the needle I5. 'I'he bore II terminates in an opening I6 in the bottom of the block I1. Mounted in the bore II is a split tube I8 which functions as a chuck to hold the needle I5 firmly in place without injury thereto. Mounted in the top I9 of the block I0 is a threaded member 20 having a knurled head 2I. It will readily be appreciated that when the needle is inserted into the split tube I8 and the knurled head 2| turned the end 22 of the threaded member 20 will engage the split tube I8 to rmly position the needle in place.

The entire device I0 may then be rubbed on an abrasive stone 25. That portion of the needle which extends beyond the opening I5 will be worn clean until full contact between the holder and the stone is established. When this is done a fine sharp point having a chisel edge 24 is produced. If desired, the split tube I8 may be eliminated but its use is preferred since it prevents direct pressure on the needle I5.

I claim:

1. A hypodermic needle sharpening device including a unitary holding block, a bore in said block extending from one side thereof at an angle through said base, said bore being reduced adjacent said base, a split tube in the other portion of said bore, a screw extending through said block and engaging said split tube whereby the tightening of said screw positions the needle in said bore.

2. A hypodermic needle sharpening device including a unitary holding block, a bore in said block extending from one side of the block through the base thereof at a predetermined angle to said base of less than said bore being reduced adjacent the base, a split tube carried in the unreduced portion of said bore, adjustable screw means extending through said block and engaging said split tube whereby the tightening of said screw means positions the needle in said bore with its end extending through the base, and an abrasive stone adapted to sharpen said outwardly extending needle end when the base of said block is frictionally rubbed against said stone. c

ENEAS G. MASCARENHAS. 

